A 055 kg book slides on ahorizontal table the kinetic, Ask an Expert

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A 0.55 kg book slides on ahorizontal table. The kinetic friction force on the book hasmagnitude 1.2 N.

(a) How much work is done on the book by frictionduring a displacement of 9.0 m to the left?

(b) The book now slides 9.0 m to theright, returning to its starting point. During this second9.0 m displacement, how much work isdone on the book by friction?

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